Comparison

Multiplier vs HipScreen

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Multiplier

This app automates complex calculations for predicting mature height, bone length, and limb length discrepancies in children. It simplifies manual methods, reducing calculation time and errors for various orthopedic and growth-related assessments.

Highlights
  • Predict mature height
  • Calculate bone length
  • Assess limb length discrepancy
  • Analyze growth remaining
  • Plot height on CDC charts
  • Scanogram calculations
  • Foot length analysis
Features
Read full description

The Multiplier App automates calculations to predict mature height and bone length in children. This method was created originally in Baltimore at the University of Maryland and subsequently developed at the International Center for Limb Lengthening (ICLL), Rubin Institute for Advanced Orthopedics (RIAO), Sinai Hospital of Baltimore. We have taught the Multiplier Method for more than 19 years at our annual Baltimore Limb Deformity Course (http://www.DeformityCourse.com). These calculations are typically performed by hand, using various formulae. Certain calculations are easy, but others involve more complicated formulae. Utilizing this app will reduce the time needed for these routine calculations and decrease errors. You need only input certain data (sex, age, length) and the app will calculate the answer by using the appropriate Multiplier formula. The Multiplier App will allow you to make the following calculations: LOWER EXTREMITY · Limb Length Discrepancy (LLD) (Congenital) · LLD (Developmental) · Growth Remaining · Bone Length · Timing of Angular Correction · Timing of Epiphysiodesis · Comprehensive (Congenital) LLD and Epiphysiodesis · Scanogram Calculations (Calculates femur/tibia lengths, overall limb length discrepancy, and amount/side of femur/tibia discrepancies) UPPER EXTREMITY · LLD (Congenital) · LLD (Developmental) · Growth Remaining · Bone Length Height and CDC Growth Charts (Calculates height at maturity, calculates height at every age, and plots the patient’s height and weight on the CDC growth charts) ACHONDROPLASIA · Height · Sitting Height · Leg Length Fetus (Calculates the length of tibia or femur at birth and maturity) FOOT · Foot Length · Foot Length Discrepancy · Foot Height · Foot Height Discrepancy Spine (Calculates sitting height at maturity) Oblique Plane Deformity (Calculates magnitude, orientation, and direction of an oblique plane deformity) Inclined Osteotomy (Calculates the rotational orientation and the vertical inclination of the osteotomy) This app also provides the following additional resources: · Bone Age: Elbow and Hand (Shows how to determine skeletal age by using radiographs of the elbow or hand) · Figures that show the standard measurements for the lower limb and foot · The multiplier formulae that the app uses to perform the calculations · Tables that show the multiplier values that are used in the formulae · Figures that show the Solomin Foot Analysis (Deformity correction planning for the midfoot, hindfoot, and ankle using reference lines and angles provided by Dr. Leonid Solomin) · Figures that show the development of the apophyses, epiphyses, and bones · Bibliography · User guide DISCLAIMER: No growth prediction method is 100% accurate; this App is not a substitute for sound and careful clinical judgment. PRIVACY POLICY: We respect the privacy of the people who use the International Center for Limb Lengthening apps. The Multiplier app does not collect, use, or distribute any data from the users.

About

HipScreen

This educational tool aids in the early detection of hip displacement in children with cerebral palsy. Developed by medical experts, it provides guidelines and tools for interpreting X-rays to preserve function and prevent pain.

Highlights
  • Educational material on hip surveillance
  • Protocols for X-ray positioning and timing
  • Tools for measuring and interpreting X-rays
  • Guidelines from leading organizations
  • Award-winning educational resource
Features
Read full description

One in three children with cerebral palsy (CP) will develop hip displacement that can be treated more effectively with early detection. HipScreen is an educational tool developed by cerebral palsy experts Vedant Kulkarni, MD and Jon Davids, MD for implementing an early detection “hip surveillance” program that can preserve a child's function and prevent pain. This app features: - Educational material based on peer-reviewed medical literature on hip surveillance for children with CP - Protocols for obtaining appropriately positioned and properly timed x-rays to identify silent hip disorders, including full hip surveillance guidelines from the world’s leading organizations - Tools to help measure and interpret hip x-rays HipScreen has been: - Awarded the 2016 Sage Award by the American Academy for Cerebral Palsy and Developmental Medicine (AACPDM) as an outstanding educational resource - Published in peer-reviewed medical journals - Featured in international cerebral palsy meetings and hip surveillance guidelines Tutorials and more information can be found at www.hipscreen.org! Disclaimer: This app is provided for general informational purposes only and is not intended as, nor should it be considered a substitute for, professional medical advice. Do not use the information in this app or accompanying website for diagnosing or treating any medical or health condition. A professional healthcare provider should be consulted for existing or suspected medical problems.

Screenshots

Multiplier4 screens
HipScreen4 screens

Verdict

The call

The clearest difference is monetization model: HipScreen at free against Multiplier's paid. HipScreen also leads on rating (5.0 vs 4.6) and review sentiment (100% vs 83%). Multiplier's advantage is ratings volume (24 vs 2). On price, update cadence, ads and in-app purchases there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

HipScreen holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Multiplier has 24 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 83% of Multiplier's written reviews are positive against 100% of HipScreen's.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 6 months. The most recent releases landed on November 1, 2026 and November 2, 2026 respectively.

Scorecard4 real differences · 6 level
Multiplier versus HipScreen: the parameters behind the verdict, then further details
ParameterMultiplierHipScreen
PriceFreeFree
Rating4.6 (24 ratings)5.0 (2 ratings) — better
Positive reviews83.3% of reviews100.0% of reviews — better
Number of ratings24 — better2
Update frequencyEvery 6 monthsEvery 6 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS13.012.0 — better
Further details — not scored
Size62 MB44 MB
Age rating12+12+
DeveloperLifeBridge HealthShriners Hospitals for Children

Customer experience

Multiplier

All ratings24 ratings
Positive95.8%
Neutral0.0%
Negative4.2%
Written reviews30 reviews
Positive83.3%
Neutral0.0%
Negative16.7%

HipScreen

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Multiplier

No in-app purchases

None

HipScreen

No in-app purchases

Questions

Is Multiplier free?
Multiplier is free to download, with no in-app purchases.
Is HipScreen free?
HipScreen is free to download, with no in-app purchases.
Which has better reviews, Multiplier or HipScreen?
HipScreen is rated higher. Multiplier averages 4.6 out of 5 from 24 ratings, while HipScreen averages 5.0 from 2 ratings.
Do Multiplier or HipScreen have ads?
Neither Multiplier nor HipScreen shows ads.
Which is updated more often, Multiplier or HipScreen?
Multiplier ships an update every 6 months, and HipScreen every 6 months. Most recently, Multiplier was updated on November 1, 2026 and HipScreen on November 2, 2026.

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